The contact owns a 2017 Chevrolet Equinox. The contact stated while driving at 55 MPH, the check engine warning light illuminated. The contact stated that there was a loud sound coming from the exhaust and there were exhaust fumes entering the cabin of the vehicle while starting the vehicle. The vehicle was not taken to an independent mechanic to be diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 144,000.